Answer:
Step-by-step explanation:
3(a+3)-6=21
<=>3a+9-6=21
<=>3a+3=21
<=>3a=18
<=>a=6
Answer:
24
Step-by-step explanation:

Negative and another negative makes a positive.

Add the fractions first.

5/5 is equivalent to 1. 7 5/5 becomes 8.

Add the numbers.

I hope this helps!
Answer:
Step-by-step explanation:
y+5 = ¾(x+4)
A = LW
A = 2/3 * 3/4
A = 6/12 = 1/2 miles^2